Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
395/85r20 vs 345/85r20 Tire Comparison Side By Side
  395/85-20 345/85-20 Difference
Diameter inches (mm) 46.44 (1179.5) 43.09 (1094.5) -3.35 (-85) -7.2%
Width inches (mm) 15.55 (395) 13.58 (345) -1.97 (-50) -12.7%
Circum. inches (mm) 145.89 (3705.51) 135.37 (3438.47) -10.51 (-267.04) -7.2%
Sidewall Height inches (mm) 13.22 (335.75) 11.55 (293.25) -1.67 (-42.5) -12.7%
Revolutions per mile (km) 434.31 (269.87) 468.04 (290.83) 33.73 (20.96) 7.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.56 mph (29.87 km/h)
25 mph (40.23 km/h)23.2 mph (37.33 km/h)
30 mph (48.28 km/h)27.84 mph (44.8 km/h)
35 mph (56.33 km/h)32.48 mph (52.27 km/h)
40 mph (64.37 km/h)37.12 mph (59.73 km/h)
45 mph (72.42 km/h)41.76 mph (67.2 km/h)
50 mph (80.47 km/h)46.4 mph (74.67 km/h)
55 mph (88.51 km/h)51.04 mph (82.14 km/h)
60 mph (96.56 km/h)55.68 mph (89.6 km/h)
65 mph (104.61 km/h)60.32 mph (97.07 km/h)
70 mph (112.65 km/h)64.96 mph (104.54 km/h)
75 mph (120.7 km/h)69.6 mph (112 km/h)
80 mph (128.75 km/h)74.23 mph (119.47 km/h)
85 mph (136.79 km/h)78.87 mph (126.94 km/h)
90 mph (144.84 km/h)83.51 mph (134.4 km/h)
95 mph (152.89 km/h)88.15 mph (141.87 km/h)
100 mph (160.93 km/h)92.79 mph (149.34 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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